Accounting machine

ABSTRACT

454,248. Calculating - apparatus. CAMPBELL, C., and BRITISH TABULATING MACHINE CO., Ltd., Victoria House. Vernon Place, Southampton Row, London. March 26, 1935, No. 9440. [Class 106 (i)] A mechanism for dividing a number by twelve, e.g., to convert inches to feet, comprises a register into which the number is entered, a counter and a set of nine dividing devices, one for each digit, each of which devices is arranged to control the entry, into adjacent denominations of the counter, of the different significant digits of the decimal fractions &lt;1&gt;/12th to &lt;9&gt;/12th. Means are provided for placing the set of dividing devices under the control of each denomination of the register in turn, for directing the entry into the appropriate denomination of the counter, and for entering the recurring digit of the decimal fraction into all the lower denominations. In the form shown a register and two counters are provided ; counters are controlled by electromagnets 213SL, 213SR, Fig. la, as in the Hollerith tabulating machine and the dividing devices are constituted by electrical relays DR1-9, DL1-9, Fig. lb, having contacts DR1-9, DL1-9, Fig. 1a for completing three circuits to three magnets controlling the associated counters. The counters are arranged with their lowest denomination operating on the nonary notation to add the recurring digits correctly. An impulse emitter EM serves to connect lines 230 in succession in circuit at times corresponding to the digits. The contacts DR, DL are arranged to connect these lines to denominational lines 522R, 522L in the manner shown in Fig. la. The coils of the relays DR, DL are connected to alternate denominations of the reading out mechanism LHRO of the register ; the reading out mechanism is of conventional form comprises pairs of brushes 512, contact segments 513 and contact studs 514. By connecting the relays in this manner and by providing two counters two digits of the number can be controlled concurrently, so that for a register having six denominations only three column shift relays are necessary, viz. 1DY, 2DY and 3DY, Fig. 1b. The dividing operation is initiated by closing contacts 503 to complete a circuit through cam contacts CC8, relay contacts 1DY2 and a relay coil IDS-T. This coil when energized shifts contacts 1DS-1-11 so that on closure of cam contacts CC12 the dividing relays DR, DL for the units and tens denominational values are energized and impulses through the emitter EM energize the appropriate magnets 213SR, 213SL, of the counters SR, SL, (not shown). After the entries have been completed cam contacts CC11 close and through the closed contacts 1DS-2 energize the column shift relay 1DY to shift its contacts 1DY-2 and close its contacts 1DY-3. Towards the end of the cycle cam contacts CC10 close and through closed contacts 1DS-4 energizes a relay coil 523 and a relay coil 1DS-L. This coil 1DS-L operates to restore the contacts 1DS-1-11 to normal. The second cycle is initiated through the alternative circuit formed by the cam contacts CC-9 and contacts 1DY-3 to energize relay coil 2DS-T which shifts its contacts 2DS-1-15 until the cam contacts CC-10 are again closed to energize restoring relay 2DS-L. After these second entries the contacts CC-11 operate to energize column shift relay 2DY whereupon the third cycle is initiated. The partial quotients are then contained in the two counters and these are added together by providing the counter SR with a reading-out mechanism SRRO and transmitting the amount therein to the counter SL. This operation is effected during the fourth cycle by energizing a relay 2CR-T which closes its contacts 2CR-5-11 to connect the reading-out mechanism to the magnets 213SL. The circuit to the relay 2CR-T is prepared during the third cycle after the column shift relay 3DY has been energized. Following this transmission operation cam contacts CC-2 close to energize reset magnet 233LH which zeroizes the register. During this operation contacts LH-1 open to deenergize the column shift relays DY. Following this operation the counter SL may be acted upon to yield the quotient; for this purpose a relay (not shown), is energized and closes contacts. D-5 so that on closure of cam contacts CC-13 the reset magnet 223SR is energized and the counter SR is restored to zero. This resetting operation closes contacts SR-2 so that the reset magnet 223SL is energized to reset the counter SL. The reading-out mechanism LHRO of the register is provided with additional brushes 512a, segments 513a and contact studs 514a arranged at the zero position so that the third dividing cycle may be omitted when the two highest denominations shown are zero.

Aug. 9, 1938. c. CAMPBELL 2,126,615

ACCOUNTING MACHINE Filed March 10, 1936 4 Sheets-Sheet l FIGJQ DR-5 v DR-Q 522R (I05 2235L ATTORNEY- 9, 1938., c. CAMPBELL 2,126,615

ACCOUNTING MACHINE Filed March 10, 1936 4 Sheets-Sheet 2 5 --ans I Mugmon BY I x) ATTORN EY Aug. 9, 1938.

C. CAMPBELL ACCOUNTING MACHI'NE Filed March 10, 1936 4 Sheets-Sheet 3 m uu; N7

' Ai'ToRNEY Aug. 9, 1938. c. CAMPBELL ACCOUNTING MACHINE Filed March 10, 1936 4 Sheets-Sheet 4 FIGS.

f INVENTOR WA ATTbRNEY Patented Aug. 9, 1938 PATENT OFFICE ACCOUNTING MACHINE Charles Campbell, London, England, assignor to International Business Machines co lm fation, New York, N. Y., a corporation of New York Application March 10, 1936, Serial No. 68,041 In Great Britain March 26, 1935 8 Claims.

This invention relates to accounting machines and more particularly to machines of theelectrically controlled Hollerith type.

Theprincipal object of the invention is to provide novel mechanism for dividing a number by twelve, in order, for example, to convert inches into feet. When any digit is divided by twelveto obtain a decimal fraction, a quotient is obtained which is either correct to a limited number of 10 decimal places or contains a recurring digit after a limited number of decimal places. Each such quotient thus has only a limited number of different significant digits, since the figures in the recurring part of the fraction are the same digit repeated indefinitely.

The following table shows the decimal equivalents of the series of fractions to 30 It will be seen that the number of different digits in each decimal fraction does not exceed three;

A further object of the invention is" to provide an accumulator capable of adding repeating or 35 recurring decimals to obtain a correct result. For

example, when adding a series of numbers such as .083, 16, 250, .353, .416, .083 on an ordinary decimal accumulator the result would be 1.331 which 50 lowest denominational order operates on the nonary notation, that is, adds from 0 to 8 and then carries, a set of nine dividing relays, one for each digit, mechanism for placing the relays under the control of the orders of the dividend register in succession in such manner that the relay corresponding to the digit registered in each order will be rendered operative, column shift mechanism for directing the entries controlled by the relays into'the appropriate denominations of the second accumulator anddevices for enterl0 ing the recurrent digit into all lower denominations of the accumulator.

In order to save machine time, it is preferred to provide two accumulators and two sets of relays of which one set controls entry into one accumulator while the other set controls entry into the other accumulator. One set is controlledby half the denominations, e. g. every alternate denomination of the register and the second set by the remaining denominations, the two sets being concurrently controlled by a pair of denominations so that while one set is'being controlled by say, the units denomination, the other is controlled by the tens and so on. Means is provided for adding the amounts in the two accumulators together by transferring the amount in one accumulator into the other accumulator to form the final quotient.

Various other objects and advantages of the invention will be obvious from the following particular description of one form of mechanism embodying the invention or from an inspection of the accompanying drawings; and the invention also constitutes certain new and useful features of construction and combination or parts hereinafter set forth and claimed.

In the drawings:

Figs. la and 1b taken together and placed one above the other constitute a wiring diagram of the electric circuits of the device.

Fig. 2 is a diagrammatic representation of the arrangement of the accumulators and the'driving mechanism therefor.

Fig. 3 is a diagram showing the arrangement oi. the readout mechanism. of one of the accumulators.

Fig. 4 is a sectional view of one of the accu- ,mulators taken through the lowest denominational order to show the readout mechanism.

Fig. 5 is a timing diagram of certain of the electrical devices.

Fig. 6 is a detail of a relay.

The machine includes three accumulators of the well known Hollerith type which are driven in a manner similar to that shown and described in the patent to D. J. Oldenboom, No. 1,944,665. This patent shows a multiplying machine in which multiplicand and multiplier factors are derived from record cards and the product which is automatically computed is ultimately obtained in an accumulator called the LH accumulator, which subsequently controls punching mechanism to punch the product back in the record card.

In the present invention the product in the LH accumulator becomes the dividend which is to be divided by twelve and in order to simplify the disclosure, all the card feeding and multiplyingv mechanism of the Oldenboom patent has been omitted and it is assumed that an amount is manually set up in the LH accumulator.

Additional accumulators designated SL and SR are provided and the quotient ultimately appears in the SL accumulator. From here it may be punched back in the card in the same manner as the product is punched back in the patent but again to simplify the illustration and confine it to the specific invention it is assumed that when the dividing is completed, the machine stops so that the quotient can be copied from the indicating wheels of the SL accumulator.

Drive-The three accumulators SL, SR, and LH are coaxially arranged as shown in Fig. 2 with the usual accumulator drive shaft 56 and reset shaft 63, the former of which carries a gear 55 driven from a vertical shaft 54 which in turn is geared to a shaft 53 which has belt and pulley connection with a motor Z. Shaft 53 also drives any ACDC generator 52 to supply alternating and direct current to the electric circuits of the machine. The usual Geneva reset drive is provided for the reset shaft 63. Such drive comprises a gear 51 on shaft 56 which drives gear 58 having pins 59 operating in slots 60 of the Geneva wheel which has an internal ring gear 6| meshing with a pinion on reset shaft 63.

Through gearing 64, shaft 56 drives constantly running contact operating cams prefixed CC "and through gearing 65 the brush 66 of an emitter EM is likewise driven to successively contact commutator segments 61.

Accumulator.As shown in Fig. 4 the accumulator SR is controlled by adding magnets 2l3SR of which there is one for each denominational order. In the circuit diagram the magnets for the accumulator SL are designated 2I3SL and those for the accumulator SR, 2l3SR. When energized, magnet 2I3SR attracts its armature 504 and unlatches a spring lever 505 which enases at toothed clutch 506 to couple a gear 501 to constantly rotating shaft 508 which is geared to the main accumulator drive shaft 56. At the end of the adding portion of the machine cycle the levers are relatched by cam mechanism (not shown) through a slidable bar 503 so that the extent of rotation of each wheel is dependent on the time at which the corresponding magnet 2B was energized. The earlier a magnet is energized, the higher the digit added in the corresponding denomination.

The gear 501 meshes witha gear 509 which constitutes an accumulator wheel and is rotatable on a shaft I509. A transfer cam 502 and an indieating wheel 50l are attached to this wheel and the former serves to rock a carry lever 510 when the wheel turns through zero. The lever 510 then conditions the carry mechanism for the next higher wheel for a carrying operation which is effected mechanically in a known manner.

The wheel 501 also meshes with the gear 5 which carries a pair of brushes 5|2. These brushes cooperate with a reading out commutator comprising a common segment H3 and a plurality of digital segments 5. The arrangement is such that each pair of brushes 5l2 turns through half a revolution for each revolution of the accumulator wheel 50! and comes to rest in position to connect the segment 5l3 to a segment 5 corresponding to the digit registered by the wheel 50!.

In a decimal accumulator the gear ratio between each gear 501 and the associated accumulator wheel 509 is 14:10 so that the gear wheel 509 turns through one revolution while the wheel 50] is turning through of a revolution. The clutch 506 has fourteen teeth so that it may engage in any one of fourteen positions. The gear ratio between the wheels 50! and 5 is 14:20.

For reasons that will be explained in more detail later, the accumulators SL and SR have their lowest denomination operating on the nonary notation, that is to say, each of these denominations adds from 0 to 8 and then carries. Accordingly the gear ratio between the wheels 501 and 509 in these two denominations is 14:9 and the gear ratio between the wheels 50! and 5| I is 14:18. With these gear ratios a rotation of the gear 501 through 9 of a revolution causes the accumulator wheel 500 to turn through a com plete revolution and carry one unit to the next denomination. This rotation of the wheel 50] corresponds, however, to an addition of nine units so that the accumulator wheel 509 will carry after each addition of nine units by it. In these two denominations there are only nine segments 5 corresponding to the nine registering positions of the wheels 505, as shown in Fig. 4. There are, however, ten segments 5 in the remaining denominations of the accumulators SL and SR which are normal decimal denominations.

The cycle of the accumulator is shown in Fig. 5 as extending from D to D and this cycle is divided into sixteen intervals each to the time required to add 1 unit and for the shaft 508 to turn through ,4 of a revolution. This shaft must thus turn through of a revolution during each cycle.

It is therefore driven by a shaft 508?) (Fig. 4) which turns through one revolution during each cycle, through gearing 5080. having a gear ratio of 14:16. The cam that effects the relatching of the levers 505 by the armatures 504 is carried by the shaft 500!) and operates once per cycle at the point marked 0" in Fig. 5.

As is usual in Hollerith counters the shaft I509 carrying the accumulator wheels may be turned forward to reset the accumulator wheels to zero. This shaft can be coupled to the constantly operating reset shaft 63 by engaging a reset clutch, diagrammatically shown in Fig. 2. This clutch is engaged when a reset magnet 223 is energized. There is a. separate reset magnet for each accumulator. In Fig. 1a the reset magnets for the register LH and accumulators SR and SL are designated 223LH, 2238B, and 223SL respectively. The reset clutch for the accumulator LH is arranged to couple a cam to the reset shaft 63 so that the cam rotates and opens a pair of contacts LH-I (Figs. 1b and 2) momentarily.

The commutators 5| 2 and 5| 4 form a reading out mechanism. The reading out mechanism of the accumulators LH and SR. are shown diagrammatically in Figs. 1b and 1a respectively and designated LHRD and SRRO respectively. The reading out mechanism for the accumulator SL is not shown in the circuit diagram, but may be employed for controlling the subsequent operations to be performed on the quotient when obtained.

It should be mentioned at this point that the circuits in Fig. 1a are supplied with AC current over a line 203 from the AC portion of generator 52, the return circuit being through ground, while the circuits shown in Fig. 1b are supplied with direct current from lines ill and 202 by the DC portion of the generator. The circuits shown in Fig. 10 may, however, be supplied with direct current if preferred.

The mechanism includes an impulse emitter EM (Fig. 1a) in the form of a rotating commutator. 'Ihe emitter EM serves to connect a series of nine digit lines 230 in circuit in succession at times corresponding to the various digits 1 to 9. If one of these lines is connected to an accumulator magnet III, the magnet will be energized at the time appropriate to causing its denomination to add the digit associated withthe line.

Two sets of dividing relays DL-l to DL-O and DR-l to DR-l are provided.- The coils of the relays DR.I to DEL-l (Fig. 1b) are connected to the units, hundreds and ten-thousands denominations of the reading out mechanism LHB/O. The coils of the other set of relays DLl to DL-l are connected to the tens, thousands and hundred-thousands denominations of the mechanism LHRO. Each coil corresponds to a digit, as is indicated by the suiilx to its designation; and is connected to the segment ill corresponding to that digit. 'Ihus with the units brush 40 ill in the position shown in Fig. 1b, a circuit can be completed through the units segment 5", brush Ill and segment ill and a line 621 to the coil DR-I to allow of the division of the units digit 3 by 12.

The relays DR.I to DR-l and DL-l to DL-J are provided with pairs of contacts arranged] systematically to connect the lines 230 (Fig. 1a) to lines "IL and 22B. Each of lines 230 corre-..

sponds to a different digit. Each of the lines I221. or 5221?. corresponds to a separate denomination of the quotient of a digit by 12. As may be seen from the table given previously, only the three highest digits in a decimal fraction canbe different digits, all lower-digits being the digit 56 in the third decimal'place, repeated.

The lines "2L, 522R provide three separate paths for the three highest digits of the quotient. The relay DL-l corresponds to or .083. It therefore makes no connection to the highest (left hand) line 22L, connects, by its contacts "b" the intermediate line 22L to the 8" line 230-- and connects, by its contacts 0 the lowest (right hand) line "2L to the 3 line 230. Thus with the contacts b and c of the relay DL l closed, impulses will flow over the line 22L at times representative of the quotient .0851. The remaining relays DL-I to DL-i are arranged to make similar connections so that the impulses transwhen' a particular relay is energized, cor- :respond to the decimal fractions given in the table above. The relays DR;--i to DR0 are duplicates of the relays DL-l to DL-4 and are provided to allow of the two product digits being divided at the same time.

The'sequence of operaflons in dividing it prod uct by 12 will now be explained in more detail with particular reference to the following example which shows the manner in which the quotient is built up in the accumulators SL, SR:

As mentioned previously the accumulators BL, SR each has a nonary lowest denominational order which adds from 0 to 8 and then returns to 0 and carries. Consequently although the lowest denomination of the accumulator SL adds 6,

3, 6, 6 a total of 21, it will carry twice and display 3 instead of carrying twice and displaying 1.

This denomination in fact adds in units each of which is $5 of the unit of the next higher denomination which is M Thus the lowest denomination adds in units of ,6 or .ooi. Thus in cycle 1 the lowest accumulator wheel of the SL accumulator will turn through six steps but will cause the accumulator to add .006. Thus the actual amount added by the accumulator in cycle 1 would be 4.166 which is of 50 and is absolutely correct. Similar observations apply the accumulator-SR. The quotient of 68971083 obtained is thus absolutely correct. If, however, the lowest denominations had been decimal, an incorrect quotient of 68971.081 would have been obtained.

' It will be assumed that the dividend, 827653,

- to be divided has been entered into the accumulator LH by manually rotating the index wheels 50l thereof. The dividing operation is initiated by the closure of contacts 503 (Fig. 1a) in any suitable manner as by a key. A circuit is then completed through these contacts, cam contacts CC8, upper relay contacts iDY-2, and relay coil IDS-T. This coil (see also Fig. 6), when energized, u'iilatches a contact operating member so that the latter permits contacts lDSl-ll to shift. Towards the end of the next cycle, cam

contacts CCl0, .(lower left Fig. 1b) closeand complete a circuit through the now closed contacts IDS-4, a relay coil 523 and a coil IDS-L of the relay IDS (see Fig. 6). The relay coil 523 closes its contacts 523a. The relay coil IDS-L relatches the contact operating member so that the contacts lDS-lli are restored to their normal condition." The coil 523'serves to maincontacts iDS-l (Fig. 1b) are shifted and the contacts 'IDS3 are closed. Thus, on the closure of cam contacts CCl2, a circuit is completed from the line 20l to the contacts CC--l2, upper contacts lDS-i, the units common'segment 5l3 and brush 5l2, the 3" segment ill, the line 521 and the relay DR-3. A branch circuit also extends through the contacts IDS-3, the tens seg ment 5 and brush III, the 5 segment 5, a line 528 and the relay coil DL-S. The contacts of the relays DR-l and DL-i (Fig. 1a) are thus closed. The contacts IDS-H and IDS9H are also closed.

As the emitter EM operates, a circuit is completed at the 2 time of the cycle through one of the lines 230, the pair of contacts a of the relayDR-J, the highest line 522R, the left hand pair of contacts of the group |DS-9l l and the third lowest accumulator magnet 2l3SR of the accumulator SR so that the third lowest denomination of this accumulator adds 2. At the 5 time of the cycle, a circuit is completed through the pair of contacts b of the relay DR-3, the intermediate line 522R. and the second lowest accumulator magnet 2 SR. Thus 250 is entered into the accumulator SR.

In the same cycle a circuit is completed at the 4 time through the contacts a of the relay DL-5, the highest line 5221., the left hand pair of contacts IDS-5 and the fourth lowest accumulator magnet 2 ISSL.

A second circuit is completed at the 1 time through the contacts "b of the relay DL-S, the intermediate line 522L and the third lowest accumulator magnet 2l3SL. A third circuit is completed at the 6 time through the contacts c" of the relay DL-5 and thelowest line 522L and then in parallel through the two right hand pairs of contacts IDS-4 and 8 and the two lowest-accumulator magnets ZISSL. This circuit takes care of the repeating digit and is branched by the relay IDS so that 6 is entered into the two lower denominations.

- The actual entry made is thus 4.166 although the relay DL- has only three pairs of contacts for selecting three impulses to represent 416.

After these entries have been completed, cam contacts CC-ll (Fig. 1b) close and complete a circuit through the contacts IDS-2 closed by the relay IDS and a column skip relay IDY. This relay closes its contacts IDY-l to hold itself energized through contacts LH-I. The

relay IDY also shifts its contacts lDY-2 (Fig.

la) and closes its contacts lDY-l so that on the closure of. cam contacts CC-9 a circuit is completed through the contacts lDY-3, lower contacts lDY--2, upper contacts 2DY-2 and relay coil IDS-T. The contacts CC-S and lDY-J are provided because the contacts 503 open and remain open after initiatingdivision so that an alternative circuit must be provided.

The coil 2DST causes its contacts IDS-l-IB to shift and remain shifted until relatching coils 2DSL are energized on the closure of the cam contacts CC-lfl during the following cycle. A relay illensures, as before, that the relays ZDS will be properly restored to normal. The relay IDS shifts its contacts IDS-I and closes its contacts 2DS3.

Circuits are then completed through the cam contacts CC-|2, the normally closed contacts iDS the normally open contacts 2DSI, the hundreds common segment ill, brush 512 and segment 5, a line 529 and the coil DRF-B and also in parallel through the contacts 2DS-3, the thousands common segment brush and digital segment, a line 530 and the relay coil DL-l. Thus the contacts of the relays DRE-G and DL-I (Fig. in) will be closed together with the contacts 2DS-5l0 and IDS-H-IS. These latter two sets of contacts connect the lines "IL and 522R to the magnets ISL and 2|! SR respectively two denominations higher than in the first cycle, and also connect the lower magnets 2l3SL and ZISSR in parallel to the lowest lines 522L and SHR respectively. Circuits are then completed through the emitter EM to enter of. 7,000, i. e. 583.333 and of 600, i. e. 50.000 into the accumulators SL and SR respectively. It will be observed that the impu se representing 3 which passes through the contact 0 of the relay DL'| and the lowest line 522L is entered into the four lowest denominations of the accumulator ZISSL. This entry is taken care of by the contacts IIl of the relay !DS. After these entries have been made, the contacts CC-ll (Fig. 1b) again close and complete a circuit through the contacts IDS-2 and a relay coil 2DY. This coil closes its contacts 2DY| to maintain itself energized through the contacts LH I and also shifts its contacts ZDY-l (Fig. 1a). Then when the contacts 00-! (Fig.'1a) close, a circuit is completed through the contacts lDY 3, lower |DY2, lower 2DY-2, upper iDY-l and relay coil 3DST.

The contacts 3DS-ll9 are then shifted and remain shifted until relatching coils IDS-L (Fig. lb) are energized in the manner explained before; a relay 525 ensures that thecontacts are properly restored. The contacts 3DS-5-l2 and 3DS--l3-l9 connect the lines IL and 522R to the two highest accumulator magnets 2|3SL and 'MSSR respectively and also connect the lowest lines 522L and 522R. to the lower accumulator magnets. The contacts IDS-4 and 3DS-3 (Fig. 1b) close to complete circuits to I the ten-thousands and hundred-thousands denominations of the reading out mechanism LHRO so that the relays DR-2 and DL-J are energized. The entries shown for cycle "3" in the above example are then made.

At this time the accumulators SL and SR contain the two partial quotients (67254.166 and 1716.916) and the next operation is to add these quotients together by transferring the quotient in the accumulator SR into the accumulator SL as shown in the above example under cycle 4. This is effected by energizing a relay ICR-T which closes its contacts 2CR-5i2 (Fig. In) so as to connect the reading out mechanism to the accumulator magnets 2I3SL. The emitter EM then transmits impulses through the mechanism SRRO to the magnets 2I3SL- at times representing the digits of the partial quotient in the accumulator SR.

The relay ZCR-T is energized in the follow ing manner. When the contacts CG-Il (Fig. 1b) close in the third dividing cycle, they energize a relay 3DY through contacts 3DS-2. This relay holds itself energized through its holding contacts 3DYI, and also shifts its contacts (Fig. lb)' is energized in the same manner as the coil 'IDSL." Thus the two partial quotients. are added together in the accumulator SL in the following cycle.

The relay 2CR T also closes its contacts ZCR-l (Fig. 1a) and, on the closure of contacts CC-2, the reset magnet IHLH is energized and the dividend register LE is reset.

During the resetting of the register LH. the contacts LHI- open to deenergize the coils IDY, 2DY and BDY.

At this point the quotient will appear in accumulator SL and the partial quotient in accumulator SR, No further operation can take place and the operator may copy off the result, after which depression of reset key 600 (Fig. 1a) -will permit contacts CCI3 to complete circuits to m'agnets 2238B. and 223SL which trip their respective reset clutches. The machine will thus be-cleared preparatory to setting up a new dividend on the wheels of the LH accumulator.

Provision is made for omitting the third dividing cycle should the dividend be less than 10,000. For this purpose the mechanism LHRO is provided with additional brushes 5I2a (lower left Fig. 1b) for the ten-thousands and hundredthousands denominations. These brushes cooperate with common segments H311 and a single digital segment 5l4a in the zero position.

During the first dividing cycle contacts IDSI2 are closed and a circuit is' completed, on the closure of the cam contacts CC-l I, through the contacts IDS-l2, the hundred-thousands segment 5l3a.and brush 5l2a, the zero segment Ella, the ten-thousands brush SIM and common segment Him and the relay coil 3DY. This coil is thus energized and its contacts 3DY -2 are shifted during the first dividing cycle. Thus when the contacts 2DY--2 are shifted late in the second dividing cycle and the contacts CC9 close, a

circuit is completed to energize the coil 2CR--T instead of to the coils 3DST. Thus the transfer of the quotient in the accumulator SR to the accumulator SL will occur one cycle earlier and the third dividing cycle will be omitted.

While there has been shown and described and pointed out the fundamental novel features of the invention as applied to a single modification, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit ofthe invention. It is the intentlon therefore to be limited only as indicated by the scope of the following claims.

What is claimed is as follows:

1. In a machine of the class described, a denominational order accumulator wheel positionable to represent a digit, a readout device including a plurality of digit representing contact segments and a brush positionable by said wheel to engage the segment corresponding to the digit set on the wheel, a plurality of relays, one for each segment, a set of contacts for each relay; an accumulator, entering means therefor, an emitter arranged to emit a series of impulses to control said entering means, there being one impulse for each digit,

each of said sets of contacts being arranged to connect said emitter to said entering means in accordance with the decimal equivalent of one twelfth oithe value of the corresponding digit and a circuit connection completed throughsaid positionable brush for energizing the relay corresponding to the digit \represented on the wheel whereby the related set of contacts will connect one pair for each group of like valued segments, means controlled by the segments and brushes for completing circuits through the relays relating to the digits in the corresponding wheels, accumulating mechanism, an emitter for emitting a series of differentially timed impulses to control the operation of said accumulating mechanism, a plurality of sets of contacts, one set for each of said pair of relays and each set being arranged and constructed to respond to control of its related relays to connect the accumulating mechanism to said emitter for control by the impulses corresponding to the decimal equivalent of the related digit divided by twelve and column shift means for selecting theorders of the accumulating mechanism to be controlled and directing the entries therein.

3. The invention set forth in claim 2- in which means is provided for causing any repeating digit resulting from the dividing operation to be entered in more than one order of the accumulating mechanism.

4. In a machine of the class described, a denominational order entry receiving device settable to represent a number, a readout device for each order, a pair of accumulators, dividing mechanism related to the units and alternate higher orders, dividing mechanism related to the tens and alternate higher orders, means controlled by said readout devices for causing said dividing mechanisms to concurrent- 1y divide the digits of adjacent pairs of orders by twelve, in succession, means controlled by said' dividing mechanisms and including column shift devices for entering the sub-quotients obtained into said accumulators, with the sub-quotients of the units and alternate higher digits in one accumulator and the sub-quotients of the tens and alternate higher digits in the other accumulator, and means for transferring the sum of the sub-quotients in one accumulator to the other to obtain the final quotient.

5. In a machine of the class described, an accumulator for adding repeating decimals including a plurality of adding wheels operable in accordance with a tens notation and a wheel positioned in the lowest denominational order operable in accordance with a nonary notation, entering means therefor, means for controlling said entering means to enter one, two or three-positiondecimal amounts in a plurality of denominational positions of the accumulator, and means effective when a three-position decimal amount is entered for causing the lowest order digit of said amount to be concurrently entered into each lower order wheel of the accumulator.

6. In a mechanism of the class described, an entry receiving device having a plurality of digit receiving orders, each settable in accordance with a digit, an accumulator in which the lowest order is operable in accordance with a nonary notation, a readout device for each order of said entry receiving device, a set of nine dividing devices, one. for each digit, each of which devices is arranged to control the entry into said accumulator of its related digit divided by twelve, means for placing said dividing devices under control'of the readout devices of each of a plurality of denominational orders of the entry receiving device in turn whereby the dividing device'corresponding to the digit registered will be operated, column shift means for directing the entry controlled by the operative dividing device into certain denominational orders of the accumulator and means for entering the repeating digit into all lower denominational orders of the accumulator.

7. The invention set forth in claim 6 in which two accumulators and two sets of dividing devices are provided with means for controlling one accumulator in accordance with half the digits and the other accumulator in accordance with the other half of the digits whereby the quotients of two digits divided by twelve are obtained concurrently and means for transferring the result in one accumulator to the other to obtain the final quotient.

8. In a machine of the class described, an entry receiving device settahle in accordance with a 15 multi-denominational dividend, a pair of accu- CHARLES CAMPBELL. 

